Remove existing user from Updates/comments thread?

It would be VERY helpful if we had the ability to REMOVE users from the distribution/notification/inclusion list of an existing Updates/comments thread within WF.

This would help b/c there are times when we want to retain the history of the conversation while continuing that conversation only with a smaller group of people than those people who were tagged within that thread early in that thread's lifecycle. I am aware that a new Update/comments thread can be started within that same area on WF, but that can be confusing for some of our users and frankly it makes finding historical elements of a conversation sloppy.

This would also help b/c we have people in our organization who get accidentally tagged on a thread which they should not be on and the notifications that they receive can be very annoying to them if they're not relevant. We then need to make a choice to either start a new thread without that person which means that the historicals of the conversation are then less accessible to the folks who need it (OR) we choose to continue the conversation with that person tagged on it and continue to annoy them but retain the historicals. We often choose the route of keeping the person who should be removed on the thread so that we don't lose the historicals but that annoyance that results becomes a deterrent for WF adoption in our org.

If/when this is added, it should be done in such a way that is not easy to accidentally remove someone.

Thank you!